Automatic shut-off valve.



- valve is increased over a normal .5 is enlar e ALBERT THEADORE GRIES, OF TOLEDO, QHIO.

AUTOMA'IRG SHUT-OFF VALVE.

Specification of Letters Patent.

Patented Mar 1309' Application filed February 4, 1909. Serial No. 476,059.

Ohio, have invented certain new and useful Im rovements in Automatic Shut-Ofl Valves an I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in automatic out ofi valves.

The object of the, invention is to a valve of this character whereby W pressure of the fluid passing t rou rovide en the gh the or predetermined point, the valve will automatically close.

A further object is to provide a valve of this character which will be simple, strong and durable in construction, eflicient and reliable in operation and well adapted for the pur ose for which it is desired.

ith the foregoing and other objects in view, the invention consists of certain novel features of construction, combination and arran ement of parts as will be more fully descri ed and particularly pointed out in the ap ended claim.

11 the accom anying drawings, Figure 1 is a longitudina sectional view of the valve showing the same in open position Eig. 2 is a cross sectional view on the line 2-2 of In the embodiment of the invention, I provide a casing 1, on one end of which is formed an interiorly threaded coupling nip le 2, said nipple being adapted to receive t e end of the fluid conducting pipe 3. The oppositeor discharge end of the casing is formed with a' threaded opening 4 in which is adapted to be screwed a tubular cap 5, the end of which is interiorly threaded, as shown, and in said threaded end is screwed the end of the fluid conducting pipe 6. The inner end of the cap g to form a seat 7, the purpose of whichw' herein appear.

In thecasing 1, is arranged a valve cylinder 8, said cylinder being supported concentrically within the casin by supporting lugs 9. In one end of the cylinder 8 is formed an inlet passage 10 and in the cylinder is slidably mounted a piston valve 12, which is formed with a recessed inner end 13. The outer end of the valve is also recessed as shown at 14 to provide a seat to receive the forward end of a valve opening spring 15. The 0 posite end of the spring 15 is en aged with t e seat 7 formed. in the cap 5. n the partition 16 dividing the recessed opposite ends of the valve is formed a relief port or assage 17. The inner end of the ca '5proects into the casing 1 and forms a va ve seat 18 with which the outer end of the valve is adapted to be engaged when the valve is forced to its closed position.

In the o eration of the valve, the spring 15 will hold t he valve 0 en against the normal or usual pressure of t e fluid passing throu h the valve casing. Should the pressure of tire fluid become greater than normal, said pressure will automatically close the valve a ainst the seat 18 thus cutting ofl the flow o fluid through the casing. The relief port 17 is formed in the valve to prevent an excess of pressure from bursting the valve casing or p filly improved valve may be employed in connection with the safety appliances of railway cars or in any connection where it is desired to automatically cut off the sup ly of fluid when the pressure of the same has reached a point above normal.

From the foregping description, taken in connection with t e accompanying drawings, the construction and operation of the invention will be readily understood without requiring a more extended ex lanation. Various changes in the orm, proportion and the minor details of construction may be resorted to without departing from the principle or sacrificing an of the advantages of the invention as de ed in the appended claim.

Having thus described my invention, what I claim as new and desire to secure by Letters- Patent is:

A valve of the character described, comprisin a casing, a fluid conducting pipe connecte to one end of said casing, a tubular interiorly threaded ca ada ted to be screwed into the opposite en of t e casing, and having ap lied thereto the connecting section of sa1d uid conducting pi e, a valve seat formed on the inner end 0 said cap, a spring seat arranged in the cap, a valve cylinder concentrically secured in the casing, a valve slidably mounted in said cylinder, said valve having recessed opposite ends, and a relief port, a s ring enga ed with the outer recessed en of the va ve and with the seat in said cap whereby the valve is held in open position. against the normal pressure of the fluid assing throu h the valve casing, and where hy when sai fluid enters said casing In testimony whereof I have hereunto set hand in presence of two nesses. 4

\ ALBERT THEAD Witnesses WILLIAM WHITTAN, WILLIAM RAMSEY.

subscribing wit ORE GRI ES. 

